9/11 Memorial & MuseumLiberty St & Greenwich St, Liberty St and West St, West St and Fulton StHours: 5pm to closeNotes: Tickets are not available in advance and are distributed on a first-come, first-served basis at the museum starting at 4pm.

Bronx Zoo2300 Southern Blvd, BronxNotes: Pay as you wish for grounds access, but special exhibitions -- like the Butterfly Garden, Congo Gorilla Forest, and JungleWorld -- are not included.

Museum of Jewish Heritage36 Battery Pl, New YorkHours: 4 to 8pmNotes: Applies to exhibitions only. There may be a separate admission price for public programs.

New York Botanical Garden2900 Southern Blvd, BronxNotes: Free grounds access; does not include entry to the Enid A. Haupt Conservatory, special exhibitions like the Orchid Show and Holiday Train Show, Everett Children’s Adventure Garden, Rock and Native Plant Gardens, or Tram Tour.

Queens Botanical Garden43-50 Main St, FlushingHours: Regular hours except April through October when it’s 3 to 6pm.